Quite literally, since Essence of Antiquity is the only 1/10 in Magic
White is also the color of pillow fortery so you might be able to last a full battalion of attacks due to cards like Kor Haven, Commander Eesha, and Ghostly Prison, ensuring you draw card after card after card
Even if you decide to pass on fetchlands, Temples and surveil lands could be reasonable options still, especially for two-color decks, so again, if you arent playing at least one and your deck can, I believe you are leaving some very low cost equity on the table
When considering upgrades for this deck, Grand Arbiter Augustine IV is worth a look-in owing to how it reduces the cost of your blue and white spells, and (rather cruelly) taxes your opponents for every spell they cast
Yorion is Ambiguous The final widely played companion is the most difficult to evaluate
The copy made by Sword of Wealth and Power's delayed triggered ability is created on the stack, so it's not "cast." Tarnation Vista Land Tarnation Vista enters the battlefield tapped